This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X300S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SID Series Double-Rod Cylinder SID40X300S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X300S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X300S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X300S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SID Series Double-Rod Cylinder SID40X300S
The AirTAC SID40X300S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This 40 mm bore model features a 16 mm rod, M12x1.25 rod thread, G1/4 air port, and 27 mm adjustable cushions at each end. The SID line is discontinued, but the SAID40X300S is an direct replacement reusing the same ISO 15552 mounting interface, bore, stroke, and porting.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life. A double-rod design prevents rod rotation and allows the rear rod to carry a sensor cam. Note that air cushions only decelerate; an external rod lock or SAIL/BSAI variant is required to hold loads on air loss.
Airtac SID Series Double-Rod Cylinder SID40X300S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X300S |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID40X300S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAID40X300S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID40X300S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SID Series Double-Rod Cylinder SID40X300S Is Used
Dual-Tool Machining Station
Drives two opposing machining heads from a single piston, utilizing the equal both-ways force to maintain perfectly synchronized cutting and feeding operations.
Anti-Rotation Transfer Gate
Uses the twin-rod architecture to prevent rod twisting during heavy lateral transfers on a conveyor line, ensuring the gate stays perfectly aligned without external guides.
Rear-Cam Sorting Diverter
Leverages the protruding back rod to carry a sensor cam, providing precise mid-stroke position feedback to the PLC while the front rod diverts packages.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X300S with the SAID40X300S
To replace the discontinued SID40X300S, specify the SAID40X300S, which matches the 40 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting dimensions without bracket changes. Because force is equal both ways, you can size both extension and retraction identically; if more force is needed, the neighboring 50 mm bore provides 825 N @0.5 MPa, or drop to the 32 mm bore for 345 N. A double-rod cylinder is the right choice when you need anti-rotation stability or want to drive two tools simultaneously. The -S suffix confirms a piston magnet for legacy CS1-B/DS1-B switches. For this 300 mm stroke, use external guide rails to prevent rod bending under side loads. Mounting options include Basic, FA, LB, and TC.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X300S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID40X300S FAQ
Yes, the SID40X300S is discontinued. The direct replacement is the SAID40X300S, which shares the same ISO 15552 interface, 40 mm bore, 300 mm stroke, G1/4 port, and equal-both-ways force.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X300S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X300S replacement — usually within 7-8 hours.